CHEHALIS TRIBAL HOUSING
PWS ID: 105300027 · OAKVILLE, 10 98568
CHEHALIS TRIBAL HOUSING serves 620 people in OAKVILLE, 10 using Groundwater water sources. It has 299 recorded EPA violations, including 1 health-based violations. No PFAS contamination was detected in UCMR5 testing.
Water Quality Snapshot: CHEHALIS TRIBAL HOUSING
CHEHALIS TRIBAL HOUSING is a native american-owned community water system that delivers drinking water to 620 residents in OAKVILLE, 10 through 114 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 299 total violations for this system , of which 1 (0%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 279 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.
The most frequently cited contaminant at this system is Coliform (TCR), recorded in 36 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.
Across 10, EPA tracks 158 public water systems serving 142,574 people, with 31,953 cumulative violations and 1,055 health-based violations on record. About 98% of systems in the state carry at least one violation, and state-wide the average per system is 202.2 violations. CHEHALIS TRIBAL HOUSING's 299 violations sit above the 10 average. Statewide, 2 of 10 UCMR5-tested systems have reported PFAS detections (20%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.
System Details
- System Type
- Community
- Owner Type
- Native American
- Connections
- 114
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 279
- Treatment Tech Violations
- 1
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 36 | 2013 |
| Chlorine | MR | 25 | 2025 |
| Gross Alpha, Excl. Radon and U | MR | 17 | 2017 |
| Combined Uranium | MR | 16 | 2017 |
| Combined Radium (-226 and -228) | MR | 16 | 2017 |
| Nitrate | MR | 14 | 2024 |
| Consumer Confidence Rule | Other | 14 | 2017 |
| Total Polychlorinated Biphenyls (PCB) | MR | 5 | 2025 |
| TTHM | MR | 5 | 2023 |
| Total Haloacetic Acids (HAA5) | MR | 5 | 2023 |
| Lead and Copper Rule | MR | 4 | 2020 |
| Revised Total Coliform Rule | RPT | 4 | 2025 |
| 2,3,7,8-TCDD | MR | 3 | 2025 |
| Hexachlorocyclopentadiene | MR | 3 | 2025 |
| Atrazine | MR | 3 | 2025 |
| Heptachlor | MR | 3 | 2025 |
| HEXACHLOROBENZENE | MR | 3 | 2025 |
| Benzo(a)pyrene | MR | 3 | 2025 |
| Chlordane | MR | 3 | 2025 |
| Simazine | MR | 3 | 2025 |
| Toxaphene | MR | 3 | 2025 |
| Di(2-ethylhexyl) adipate | MR | 3 | 2025 |
| Methoxychlor | MR | 3 | 2025 |
| Di(2-ethylhexyl) phthalate | MR | 3 | 2025 |
| Endrin | MR | 3 | 2025 |
| Arsenic | MR | 3 | 2005 |
| LASSO | MR | 3 | 2025 |
| Heptachlor epoxide | MR | 3 | 2025 |
| BHC-GAMMA | MR | 3 | 2025 |
| Pentachlorophenol | MR | 2 | 2011 |
Verify This Water System
The figures above are aggregated from EPA's public databases. To verify the underlying records — or to file a complaint, request a Consumer Confidence Report, or check current monitoring status — go directly to the federal and state regulators that enforce the Safe Drinking Water Act for CHEHALIS TRIBAL HOUSING.
EPA SDWIS — Federal Reports
EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:
View PWS ID 105300027 on SDWISSource: EPA SDWIS Federal Reports Search
10 Drinking Water Authority
10's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.
Find 10 regulator via EPA SDWISViolation Timeline
Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.
| Year (latest) | Contaminant | Category | Count | EPA Record |
|---|---|---|---|---|
| 2025 | Chlorine | MR | 25 | SDWIS / 105300027 / 0999 |
| 2025 | Total Polychlorinated Biphenyls (PCB) | MR | 5 | SDWIS / 105300027 / 2383 |
| 2025 | Revised Total Coliform Rule | RPT | 4 | SDWIS / 105300027 / 8000 |
| 2025 | 2,3,7,8-TCDD | MR | 3 | SDWIS / 105300027 / 2063 |
| 2025 | Hexachlorocyclopentadiene | MR | 3 | SDWIS / 105300027 / 2042 |
| 2025 | Atrazine | MR | 3 | SDWIS / 105300027 / 2050 |
| 2025 | Heptachlor | MR | 3 | SDWIS / 105300027 / 2065 |
| 2025 | HEXACHLOROBENZENE | MR | 3 | SDWIS / 105300027 / 2274 |
| 2025 | Benzo(a)pyrene | MR | 3 | SDWIS / 105300027 / 2306 |
| 2025 | Chlordane | MR | 3 | SDWIS / 105300027 / 2959 |
| 2025 | Simazine | MR | 3 | SDWIS / 105300027 / 2037 |
| 2025 | Toxaphene | MR | 3 | SDWIS / 105300027 / 2020 |
| 2025 | Di(2-ethylhexyl) adipate | MR | 3 | SDWIS / 105300027 / 2035 |
| 2025 | Methoxychlor | MR | 3 | SDWIS / 105300027 / 2015 |
| 2025 | Di(2-ethylhexyl) phthalate | MR | 3 | SDWIS / 105300027 / 2039 |
How CHEHALIS TRIBAL HOUSING Compares
Cross-reference this system's record against state averages and the federal MCL framework for context.
| Metric | CHEHALIS TRIBAL HOUSING | 10 avg | Federal benchmark |
|---|---|---|---|
| Total violations | 299 | 202.2 | SDWA compliance — any non-zero count is a recorded breach |
| Health-based violations | 1 | 6.7 | Indicates a contaminant exceeded a federal MCL |
| PFAS detection | None | 20% | EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt |
| Population served | 620 | 902 | Sizing context for compliance burden |
Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 158 regulated public water systems in 10.
Federal MCL reference — Safe Drinking Water Act thresholds ▼
| Contaminant | Federal MCL / Action Level | Note |
|---|---|---|
| Lead | 0 mg/L (Action Level: 0.015 mg/L) | Lead and Copper Rule treatment technique |
| Arsenic | 0.010 mg/L (10 ppb) | Health-based MCL since 2006 |
| Total Coliform | Treatment technique (RTCR) | Indicator organism, monitoring trigger |
| PFOA / PFOS (PFAS) | 4.0 ppt each (final 2024 rule) | Compliance deadline 2029 |
| Nitrate (as N) | 10 mg/L | Acute health risk for infants |
Frequently Asked Questions
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Related Data for 10
Read our methodology — how this data is sourced, computed, and verified.